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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d191dd0726b860412157cdd944f500d428246b395f3266131c48483d6692b88' 
  AND token = 'MQwhGIeQAl7bd1FoQUvlpTLbriGahouvU4pitXLfQFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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