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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67fd01b357b1762281d8c9457320135d46fd5af1af5d7dbb9bd2ea84ad17d2b' 
  AND token = 'Hi2ok1oy2sxyUiGEYs2Yi9BN7uSZ8xPTH6Mua3582Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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