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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91acfd353a5b3a245c7a223a09790e4a60a244cb93b07369b9b87cdfa6031d7' 
  AND token = '33WHh20NFl3iAPUa7RuWHX0nB7uR7gJam0J4KuZ97Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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