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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af6122a5d3402fb81f73de0ed8a29bc54083380b63a58e76c6c97b27c2d5464' 
  AND token = '46t1ssdY4wNwx1iXp+egQuoDNjGBYG0h918pwfTpC+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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