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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1e02fcc13069d9b1052b3cba2a081462ce36cb8eddbd780c8faa9280503861' 
  AND token = '3U+UUv73EReZXqNrv3yN7WCpATxP+azKNXiD5abXrKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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