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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5667ee5b66c723e4d75c7b709f071089fb1af4e3c8d6fb699db5a8bc80a6dfe8' 
  AND token = 'fqidYHX3cNQhCcLREJl+U7uGyVRJUxZEq5lMYbEuhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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