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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9587920765ab2558ab4fd59c7701b1ba4cf9cc3ae9dde2ba91149f2781aaeb67' 
  AND token = '1Si0GOVXt6Lti1XkwezY60d7Mr7I8+qTxIZ8qjAH9JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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