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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a705ea7ac6a43f7ae1af6acc654c6c8700a4978d5968444a372f16b01d9eae0a' 
  AND token = 'OKlJmcBBVf/UX+5eygkUdmazYmjL1ujbNhR3vTCfLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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