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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f4612dc5926ed8eb2f909756bf2df44d48c85ae9507e68f03348d7e35fb5f1' 
  AND token = 'kPestkIDDtdhwe7OkvrITm9CBGSk/95FXza68H/o9Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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