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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd78f919b6c46e60bcddc298c6986c952a0f182407f8a1859e0df65031caaa6' 
  AND token = '7YXLpbi+2dIT8KpcaDeAP7ErpfkpoRM+HbPJDO5EQGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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