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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716cf426ccfaf408ac7b5360b44d86af36736d74cbd9e0e4679bc8b1b7559c4f' 
  AND token = 'yGa4w+5AKlKY3TQjOCAB78f/Bfu5dXKHXUSDEtZ0OnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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