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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6539498c473d3b9955b6c937d12e17999563d014195bd439acf19e4cc323897d' 
  AND token = 'XGRen9+YSbP8gnouPj9NCoBKnfbJoGKsbKL22TPXRQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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