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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede21798ca64ada44a7550d45d243ab5ed99954c2860fd4caf7e8a4733071465' 
  AND token = 'wfJY+5TOewbdID/faY2asQTqarvqQp7X3G19TP6wDhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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