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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bc575db53541c3a1772da25d05576d9cec68de30f8c028e8727872393d1d41' 
  AND token = 'xF60ni+FNfQ+FyZrIDFOZewlu31XT2roBc0pT9EBDDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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