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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec137a3d8b9db16c84a7763190d5159b023b83aac3a0d631eb7ebbeb7d979f2' 
  AND token = 'euRxtkUcwPo7gZjTbBOSsb1p8dp4cQBGo+we5ZOh2DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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