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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5049dd142738b4c82edef26559761ae20b0f2bd1830ef2e09652ea1113b1afff' 
  AND token = 'Ow37uw67S3f1qqJuXL94Oywkv3Hwf4+o+BH6Nh7xxhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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