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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e11f79270d57f4ccca4f50d7930c82fac6827c5cb1b61b8f75b5b6de0e4a1c' 
  AND token = 'uzdyMd+3PZBcGb47id8bs4g5efK39/YAUP2iFuPAGjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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