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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd8af036d1942895e7330766ac0353eca6dda5c45f75c1425dad16917dbab14' 
  AND token = 'fw9gCf9cnaBC8hCS2YlYcy2OlIbYUkZBCSSGwS0Urvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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