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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bc9ff23a834fe6681447ab44bc73b72bcb890a4d666fec7b1ee1e4946df0ec' 
  AND token = 'Vl02AaYqIceXDezXWfTDqV8jB0RVj1N9KZhuMDUTisQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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