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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1932d26509422c8a106c18a3aae989211ab1492995f01a5d851e0c41232495' 
  AND token = 'uCWSjcfsaTLcb5EwftLqN05Y8tq+7tGqAsj9U3Lr/gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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