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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1d41317883df6364fdaa424faf962e53e01bd66f8921e76af8e9daf7db0ea9' 
  AND token = 'ZCUaUWdpZRbFaZjNhUj+xDhXIouF0AmXH2G9KJkdJsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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