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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322f65924fb80e7222a87a3e91a78349760a0afed63325348e7212f605fb6364' 
  AND token = '5jWhd1q21JJLwhrqVoKlwTf5fSuQQeLoRiAkvPB9Bu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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