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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd960cc9e73cfbb93f80b48295157b8fd925bbbbf417e044af5294db022768dea' 
  AND token = 'OffFNRNDQI4ToQHVgdZWsp3BwhW7a3qt1Dt1OqK562c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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