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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642c71984e93b7c247fea542a7e87ccbcc4b3b6024d3f1279ef466cb58ccc269' 
  AND token = 'P8PY3S+/Lqg+k7KmkALwPLLYN58MW3gmSutafnqm6jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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