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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a71e6f26c4ee6d09b92efdc3a6bda04464537453ee7468cc110d30851aab922' 
  AND token = 'kOVHrujLo8LuhDCOqM5gsxC0A4ZO6k4x9ctnIuuu3uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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