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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d0ea9368983674d7df7d70c83a584cff8e16190c8a2f79793a28cf379dda75' 
  AND token = 'D5BX0smTevIB3Widrh/Q1Hotqcf7+Y6BTmmaWXKT+e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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