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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee7a393942e56c026e729c60215c73fd96f3a45ac162d93c51c9ae1b5d3bd0e' 
  AND token = 'BXdA8ddXqbSWCwdTp0KM6L88Jh4UZtC+uzp4Vt84Xz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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