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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58761dfaea7b24ff12153cc461a77a1554f5df01e70f399cda00b11f1a99a32c' 
  AND token = 'a2Uu6Qj82sgYQQYmLqN3cf46F4BfictulNO1yPduVik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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