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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6e1272a1eeb7ad3a093ff784027ac57ef22080943a2aa264be320eb75b0d41' 
  AND token = 'D7xV73cyCtOuXba6Wx7W0MUkg70iaS/dUpGwJArOrJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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