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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385e56af1e3ebcca5a95089b94dd926a2c0e20c1b44e6729d2c88562dec7db9c' 
  AND token = 'wfKBF0y8M5LrGZCda3RMUwY48dkuxHwV3tkrv1gO1iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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