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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea5feda9ffa8ebceada69cbe85ff1c6b8c8ac056f1f24b0dc9f5efa4aa5d207' 
  AND token = 'Bmx7ePLrTaMp6FutN6r4zexNTA3tuskTph6ggincdPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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