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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e839f593254b02d1cec43f6c20db84ccb682e027fae5a4a3391fb674a13c7e' 
  AND token = 'h/+tzgziPvskTmt5UlOah1l//5yA00j6MTdSiiU7tgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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