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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ceefb22b8dd272d630638f1bfc7bea1d0b2445de20c24bcd630a7601f0645e' 
  AND token = 'BwD52qTgwWrs7ZSj/l602h946dDoaXtkHD5U6/yQkQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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