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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403d3de57ad28f9f3b14bae1ee9556121f1c88cf5b3a5bef7b1e285f53467ee9' 
  AND token = '3Ze02WyA9uNYE9YbdlKNV+fqG8eCpebheelIJbYmd+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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