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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6787ef021937fbf58fdc7c04e42f84e3761de8719a1b961fd5ac4f9b2683dbaa' 
  AND token = 'mULL/+R3iM3QpVvWjHf0XpKDsS82aEkfgs5GtYsb3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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