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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce79345b3aa1582156301b58b2e1992b614051bcb2cd61405dac5d9b159cc84' 
  AND token = 'tGeLiC6DlDyJ9Hy1VQPTzvwT8HudttYA4oQUqGQN03g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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