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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766438f6d0dfc890b144387fe504a87f50d810b9faf42f9ceae73c6b63e11e0f' 
  AND token = '6wiWl/9442oc6NGu/sF1fu8zEEA98C3/tGv/iIHlGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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