SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb9f071dbed464a62b89bc3791c673b78ce231f2d1db9e98b3786408409dd5e' 
  AND token = 'x5E+YrgFMo/BJliPINTeNNqjaC2w5snTU14iVBmpEv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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