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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a20f91b5e9f44a9186988030217f6fe099e810f3489624e40bea8b46b00b71' 
  AND token = 'X+KTw0TbLF30EmCQ5cmgZWaWDVjCaBWjZOSExAFAmow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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