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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28476c740f94800464556c12371e2464eaaf7c53601895ae9849961a6548a3a' 
  AND token = 'lLvLDP7S+LTfB2V2LatR+fsxaNUWJ43UOsjW1Dupkns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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