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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc828d567349b820a516a04ea5439bb647dbedf82e5b5284e857315581c0b2e7' 
  AND token = '/U/fT/2xg/4Ltw5rYuYCA1AUPezdL+yl1Q5YBPbxWuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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