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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0679cef60f6595198bbeba16ae885083fe27ff5cf578f67e1a5de89e6cfb923' 
  AND token = 'utp2YlFR6g10n3FLG2U9arw+59/5IC2J7J+jUo5jjLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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