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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d1ad3d476b56d65a818d09f04efa182298604b9225a876863a9da9ea899f72' 
  AND token = 'd8ZqcZAeoM2D4qyO34eC1ih8B74YQ9z4SW6AkFnVXzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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