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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec8bd6668ca40e1884384bf1e651b69f6d4da51b5823640ef0d80015d3cce3c' 
  AND token = '4JwbYJg4wuS09LP2XipvXhtrYhzrxTpzW2yTHNqlAgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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