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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfd5f1488356c1cda238b9e40b80d91310a8ad410a5d76de898463fd6944620' 
  AND token = 'eIKav378NQD6D7ahhRoQnxqjzFpxpKn79aLKwuxnlfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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