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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f7592024a6ecf2c5cfc1e389506099847c7e4783b34330cc2ae21ddcb89b85' 
  AND token = 'FMygpXRVOj0rEsOjmX5bMfFAscRaXsi6gK1ucbUDrtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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