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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf061043a8f958e22caff59a7739dc44fd8a9938d9172b6864a99aaa536f47f' 
  AND token = 'M3GoQUTX8IE9IT60pgOAxQWb87EUEfowzlBHiO9fvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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