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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2435c9976eda5634d9738ed9d708cdaeececc09f75283795935bdd8448554c9b' 
  AND token = '7BgvKBv9iPa4vMNWdYZrDbS9Mx4+B3/QUUyT2bcIJvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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