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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746f15472b75eec7abdd566a76b7db9dbcb5e83747bcb5b8c03b741e1ae62b67' 
  AND token = '65LAIgQgg0/9rMWy2tfocq/IFFu0uqXk5jmc10WIF6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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