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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0287b7eff02970a40d58b9a691fc21d64bb8ec2c53b3e0e1b020d03baaf254e4' 
  AND token = 'bIvPJwGKeBYjxbprPSJ1giczM6XjIti3hbiYWqAJv28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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