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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334d5cd86a0fdf43ba5ace7c9b696cc19579f5b11af2f2a9dff79c9775fc2874' 
  AND token = '+xD6BxJNSfP8kSlRV05TWLomIXblywWA3lS06buX7iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}