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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeeca59cba1556224d6d1e7b3c2230ed3f7a2f4a266c04ef889d50d910cdc92a' 
  AND token = 'WZKmpM7yTRsvwp06CV1z1IwVTZmcjLDAhND1lEJsSxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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