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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee79185ce4679a03b218bfa7c2f8a00c612bfc827a76fbbe84bd33af3ed43a32' 
  AND token = '1ucVloyNaKrq0TzhrNNtMfs/ZeKAEEUg640EWgeP6z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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