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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180d8becdc9ca13ad58f42b9da44271e1c22ec8b72d41e847dc4e83aaf285104' 
  AND token = 'Ko4JmqPwn/Zlo8Mb6uG+Nn5vvW03XwDwx7+qEDNJKKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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