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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c696167bfac4255438ab7820e15200c38b8b79e9cb64d7a95f86bf0e3fb9ac44' 
  AND token = '9ctxh7GLF4UyDfmuoZZrwA4OSILPz7fzS3JA6hjTMQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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