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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4128cce272e449bd77e9ed9fa343a545fef6a5c3e9443178f1088c7dd28588a6' 
  AND token = 'wCbKAfokj6iO49DYdMG2N82yF/T5lJZr1eQodMoboX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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