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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3774ca12b86ce25e5747584c9282cde84b0df6dfdadf3c5f4c9d59f765d3bf9f' 
  AND token = '4C/kzXOe908ZAXvQTLbOQoFpes6bN1ssW9q304s+H0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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